Wireless is an old technology; however with the advancement of science and technology it has enabled us to send signals to one or more devices without tangible wire connections and reduced complexity. The increasing human needs have lead to the integration of different technologies into a single unit and Wireless Sensor Network (WSN) is one such integration where sensors are integrated with wireless system to form a network. This network is used for a plethora of applications in sectors like

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... in sectors like defence, agriculture, medical, environment and industry. This paper is intended to be a resource for students and researchers interested in the state-of-the-art in various application areas of Wireless Sensor Networks (WSNs).